Fix template cache dir permissions

Author: DrMurx

Dockerfile

@@ -11,6 +11,8 @@ RUN apk add --no-cache bash curl dovecot mysql-client c-client imap-dev su-exec
  && rm -rf /var/cache/apk/* \
  && curl --location https://downloads.sourceforge.net/project/postfixadmin/postfixadmin/postfixadmin-${VERSION}/postfixadmin-${VERSION}.tar.gz \
     | tar xzf - --no-same-owner --one-top-level=/www --strip=1 \
+ && mkdir -p /www/templates_c \
+ && chown nobody /www/templates_c \
  && mkdir /config
 
 COPY config.php php.ini run.sh /